Django过滤器不起作用答案

【问题标题】：Django filter not workingDjango过滤器不起作用
【发布时间】：2016-10-08 05:49:31
【问题描述】：

我的过滤器不起作用每当我访问http://localhost:8080/payables/invoices/?status=NOT_PAID 时它只会返回所有发票。我没有运行时错误，我输入的参数似乎被忽略了。我真的不明白，除此之外，它很好用。

views.py

class InvoiceViewSet(viewsets.ViewSet):
    serializer_class = InvoiceSerializer
    filter_backend = filters.DjangoFilterBackend
    filter_fields = ('status','supplier',)

    def list(self,request,):
        queryset = Invoice.objects.filter()
        serializer = InvoiceSerializer(queryset, many=True)
        return Response(serializer.data)

    def retrieve(self, request, pk=None):
        queryset = Invoice.objects.filter()
        invoice = get_object_or_404(queryset, pk=pk)
        serializer = InvoiceSerializer(invoice)
        return Response(serializer.data)

class InvoiceItemViewSet(viewsets.ViewSet):

    serializer_class = InvoiceItemSerializer

    def list(self,request,invoice_pk=None):
        queryset = InvoiceItem.objects.filter(invoice=invoice_pk)
        serializer = InvoiceItemSerializer(queryset,many=True)
        return Response(serializer.data)


    def retrieve(self,request,pk,invoice_pk):
        queryset = InvoiceItem.objects.filter(pk=pk,invoice=invoice_pk)
        invoice_item = get_object_or_404(queryset,pk=pk)
        serializer = InvoiceItemSerializer(invoice_item)
        return Response(serializer.data)

url.py

from django.conf.urls import url, include
#viewset
from rest_framework_nested import routers
from payables.views import InvoiceViewSet,InvoiceItemViewSet

router = routers.SimpleRouter()
router.register(r'invoices', InvoiceViewSet,base_name='invoices')

invoice_item_router = routers.NestedSimpleRouter(router,r'invoices',lookup='invoice')
invoice_item_router.register(r'items', InvoiceItemViewSet, base_name='invoice_items')

urlpatterns = [
    url(r'^',include(router.urls)),
    url(r'^',include(invoice_item_router.urls))
    ]

【问题讨论】：

标签： django python-3.x django-rest-framework django-filter

【解决方案1】：

这是因为您明确地创建了查询集，因此过滤器后端从未使用过：

queryset = Invoice.objects.filter()

我建议查看ModelViewSet。在这种情况下，您只需在视图级别传递queryset，其余的将被处理。

【讨论】：

嗨，我如何正确地将查询集传递到“视图级别”？我应该向 InvoiceViewSet 中的列表函数添加另一个参数吗？例如 def list(self,request,queryset):?
您使用的是ModelViewSet。如果是，那么您可以按照文档查看它是如何声明查询集的。

【解决方案2】：

而不是queryset = Invoice.objects.filter()

使用queryset = self.get_queryset()

self.get_queryset() 返回过滤后的对象列表

【讨论】：

【解决方案3】：

而不是queryset = Invoice.objects.filter()

queryset = self.filter_queryset(self.get_queryset()).filter()

【讨论】：